Gearbox whine
 

Hi, i'm looking for any info on a whine from my 2002 grand voyager 3.3L gearbox.At first it was only low gears when it was hot,but since taking it to my local garage to get gear oil changed,it is loud through all gears all the time. Mechanic says gearbox needs changed,but doesnt work on gearboxes himself. Any help would be appreciated. thanks
dun211